This is exactly what I did with mine.

I have two concerns with this setup.. firstly, the box is a fair bit further forward than the OEM kit - I'm waiting to see how my wife feels about the available pillion space! Secondly, having only two anchor points in a single plane bothers me.. I've always had three anchor points for the adapter plate (the third using one of the bolts of the box mount). So far it's remained stable, but I'm checking it regularly. That said, the Givi brackets+plate kits have only two anchor points, so maybe it's totally fine!
